I highly recommend this great article that ran a couple of months ago in the great EdSource.
It's about the high turnover of superintendents, and the reasons why. A couple of gems:
The “honeymoon” with the school board lasts between 12 and 18 months before “political interests and dysfunction show up” former school superintendent Santiago Wood said for the piece. A board
may have hired a superintendent to institute reforms, but when interest
groups such as unions or community organizations complain, the elected
board gets uncomfortable, Wood said.
“Even if you agree on the results,” Becca Bracy Knight, executive director of the Broad Center for the Management of School Systems in Los Angeles, “change is
painful. It is so critical that superintendents have the backing of the
governing board when they go down that road.”
The board and
superintendents must agree not only on what changes they want to see,
but also how quickly and what sacrifices they are prepared to make to
get there, she said.